Communication system and method for serial port bridging of vehicle-mounted terminal

Abstract

The invention discloses a communication system for vehicle-mounted terminal serial port bridging, which comprises a GPRS module, a central control module and a vehicle-mounted terminal display module, the GPRS module comprises a bridge unit, a COM unit and a transmit-receive unit, and the central control module comprises a processor unit, a memory unit and a power supply unit. The vehicle-mounted terminal display module comprises a voice control unit and an image-text display unit; the GPRS module realizes wireless signal bridging among the vehicle-mounted terminal, the user side, the local area network and the wide area network side by utilizing a wireless packet high-speed transmission signal technology; compared with a traditional vehicle-mounted terminal serial port bridging communication system, the vehicle-mounted terminal serial port bridging communication system has the advantages that the function of regulating and controlling the serial port bridging speed through the computer coding language is achieved, the effect of increasing the serial port bridging communication speed is achieved, and the safety and reliability of vehicle-mounted terminal communication in the driving process of a driver are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing of vehicle-mounted communication systems, and more specifically, to a communication system and method for serial port bridging of vehicle-mounted terminals. Background Art

[0002] With the continuous development of social economy, more and more cars have entered well-off families. The current automobile industry is developing rapidly. Improvements have been made in automobile development from fuel consumption to new energy power consumption, saving oil energy and alleviating air pollution. In addition, improvements have been made in all aspects of automobiles. The well-known on-board terminals have also been combined with network technology to realize intelligent transportation in car navigation, communication and monitoring vehicles. The serial port bridging method is often used in the communication system of the on-board terminal.

[0003] In the current technology, serial port bridging uses a bridge to implement network bridging communication in a serial interface, allowing various devices to connect and communicate. However, there is a problem that serial port communication transmits data one bit at a time in sequence, and the serial port bridging communication speed is slow. In addition, there are many traffic accidents caused by drivers answering mobile phone calls while driving. Therefore, when drivers encounter mobile phone calls during driving, they can receive them through the voice control method of in-vehicle communication to improve driving safety. However, during driving, the in-vehicle communication system often directly receives the caller ID from the in-vehicle terminal display, and cannot intelligently detect the communication information for interruption processing, causing the driver to have invalid information interfering with driving. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a communication system and method for serial port bridging of vehicle-mounted terminals, which overcomes the problem of difficulty in source code extraction based on source code insertion, facilitates the subsequent output of function graphs and hybrid dynamic modeling methods, and ensures the accuracy of modeling and analysis data in the analysis method process based on multi-node automatic modeling, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a communication system for serial port bridging of a vehicle-mounted terminal, comprising a GPRS module, a central control module and a vehicle-mounted terminal display module, wherein the GPRS module comprises a bridge unit, a COM unit and a transceiver unit, the central control module comprises a processor unit, a memory unit and a power supply unit, the vehicle-mounted terminal display module comprises a voice control unit and a graphic display unit, the GPRS module utilizes wireless packet high-speed transmission signal technology to realize wireless signal bridging between the vehicle-mounted terminal, the user end, the local area network and the wide area network end, and is used for real-time online packet transmission of communication signals to the user end, the central control module is used for the vehicle-mounted communication system to calculate and process communication information and control the connection of network communication signals, the vehicle-mounted terminal display module is used to process the graphic and voice information displayed on the incoming call communication, and intelligently control the incoming call communication and display the communication information through the vehicle-mounted terminal.

[0006] Furthermore, the GPRS module combines mobile communication technology with data communication technology to enable the vehicle-mounted serial port bridge communication system to quickly and in real time connect to the user end. GPRS is based on GSM and uses packet transmission of data information. The bridge unit in the GPRS module refers to connecting, transmitting signals and intelligently controlling the devices at both ends of the serial port through a bridge. The bridge is a transmission storage device connecting two networks and is used to expand the local area network. The COM unit refers to a serial communication port. The interface connecting each device in the vehicle-mounted communication system uses a serial port for communication over longer distances. The transceiver unit refers to a device for sending and receiving signals between the wireless network and the vehicle-mounted communication system. It includes a receiving device and a transmitting device. In the system, wireless signals are received through the wireless network and transmitted in GPRS. The computer control system calculates information data results and issues execution instructions from the transmitting device. The purpose is to conduct wireless communication and expand the communication network domain through GPRS.

[0007] Furthermore, the processor unit in the central control module includes a CPU, an MPU and an A / D converter. The processor unit is used to identify, analyze, extract, convert and store the communication information received by the serial port bridge. The CPU is the core of the processor unit for computing data and is an execution unit for receiving information processing and program running. The MPU is an operation unit for extracting program running instructions, executing instructions and exchanging information with external memory and logic components. Both the CPU and the MPU process control data. The MPU is composed of a register stack, an operator, a timing control circuit and a data bus, and performs operations, storage and control on the received communication information. The A / D converter is an electronic component that converts analog signals into digital signals. In the vehicle communication system, the electrical signal generated by the transceiver unit with a continuous period of time and continuous amplitude is converted into a digital signal with discrete time and discrete amplitude. The memory unit in the central control module refers to the memory component of the timing logic circuit that stores data and operation programs during the system transmission signal, and the purpose is to use the central control module to receive communication information processing.

[0008] Furthermore, the power supply unit in the central control module provides current to the GPRS module, the vehicle terminal display module and the central control module in the network, so that the receiving device of the communication system can receive signals in real time without interruption. The power supply unit includes an integrated circuit and an I / O interface control. In the system module, each device is connected through an integrated circuit for connecting power and transmitting signals. The port where each device is connected to the integrated circuit is an I / O interface. The power supply unit can control the I / O. The purpose is to use the power supply unit to provide uninterrupted continuous current to ensure the real-time operation of the communication system.

[0009] Furthermore, the vehicle-mounted terminal display module displays communication information on the display screen of the vehicle-mounted terminal. Displaying data is the last step of data information feedback and human-computer interaction after data processing. In the vehicle-mounted terminal display module, the voice control unit, on the one hand, refers to the vehicle-mounted terminal displaying the incoming call communication information through voice synthesis technology to remind the driver whether to answer the incoming call. On the other hand, it refers to the driver receiving voice information through the voice sensor, performing voice recognition, extraction, analysis and conversion into a digital signal processed by the CPU, and transmitting the signal through the transmitting unit in the GPRS module to feedback to the caller. The graphic display unit refers to the communication signal received by the processor converted into an image and text content on the terminal display module through GPU processing operation. The purpose is to display the processed communication information from the vehicle terminal and perform voice control processing.

[0010] Furthermore, the communication system for serial port bridging of the vehicle-mounted terminal receives incoming call communication, and the specific judgment process steps are as follows:

[0011] A1. First, start GPRS to receive communication signals. If no signal is received, the terminal will not display. If a signal is received, the serial port transmission signal will be processed and stored in the central control module to determine the incoming call communication;

[0012] A2. If the incoming call is judged to be a nuisance call, the central control module intelligently interrupts the communication connection and the terminal does not display it. If the incoming call is judged not to be a nuisance call, it is displayed on the vehicle terminal by voice and text conversion;

[0013] A3. Finally, the user receives or rejects the incoming call displayed on the vehicle terminal through voice control. The voice controls the GPRS module to send a text message to notify the caller. The user is in a driving state and it is inconvenient to answer the incoming call.

[0014] Furthermore, a communication method for serial port bridging of a vehicle-mounted terminal specifically comprises the following steps:

[0015] S1. First, the serial port bridging method is used in the vehicle communication system to connect each module to the network, in order to transmit communication information using serial port communication;

[0016] S2. During the communication process, the speed of sending and receiving signals is increased by improving the communication speed of the serial port bridge. The purpose is to increase the communication speed of the serial port bridge;

[0017] S3, then the central control module reads, writes, analyzes, programs and stores the serial port receiving and sending signals, with the purpose of processing the received communication signals;

[0018] S4. Finally, the processed communication information is displayed on the vehicle terminal in the form of pictures, texts or voices, with the purpose of human-computer interaction with the processed communication information.

[0019] Furthermore, the communication speed of the serial port bridge is improved by adjusting the parameters of the serial port communication. The parameters that can affect the communication speed in the serial port communication include baud rate, data bit, stop bit and parity check. The baud rate refers to the number of bits transmitted per second. The serial port baud rate is increased by using FPGA and the baud rate is increased by using computer language to control the division ratio. The FPGA is a programmable logic array chip that can control the I / O interface, RAM processor and wiring. The purpose is to find a way to improve the serial port bridge speed by increasing the baud rate.

[0020] Technical effects and advantages of the present invention:

[0021] Compared with the traditional vehicle-mounted terminal serial port bridge communication system, the present invention realizes the function of regulating the serial port bridge speed by computer coding language, thereby achieving the effect of increasing the serial port bridge communication speed.

[0022] Compared with the communication method of serial port bridging of the vehicle-mounted terminal, the present invention realizes the functions of the driver's voice control of the vehicle-mounted terminal to display communication information and the vehicle-mounted terminal display intelligent interruption of interference incoming call communication, thereby improving the safety and reliability of the vehicle-mounted terminal communication during the driver's driving process and achieving the effect that invalid communication information does not interfere with the driver. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A block diagram of a communication method for serial port bridging of a vehicle-mounted terminal according to the present invention;

[0024] Figure 2 A communication system diagram for serial port bridging of a vehicle-mounted terminal according to the present invention;

[0025] Figure 3 The present invention is a flow chart of a judgment process for a vehicle-mounted terminal to receive an incoming call. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0027] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0029] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0030] It should be noted that similar reference numerals and letters refer to similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0031] The present application is applied to a computer system / server, which can operate with numerous other general-purpose or special-purpose computing system environments or configurations. Examples of well-known computing systems, environments and / or configurations suitable for use with the computer system / server include, but are not limited to, personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0032] The computer system / server may be described in the general context of computer system executable instructions (such as program modules) executed by the computer system. Generally, program modules may include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. The computer system / server may be implemented in a distributed cloud computing environment, in which tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules may be located on local or remote computer system storage media including storage devices.

[0033] Example 1

[0034] The present invention provides a communication system for serial port bridging of a vehicle terminal, comprising a GPRS module, a central control module and a vehicle terminal display module, wherein the GPRS module comprises a bridge unit, a COM unit and a transceiver unit, the central control module comprises a processor unit, a memory unit and a power supply unit, the vehicle terminal display module comprises a voice control unit and a graphic display unit, the GPRS module utilizes wireless packet high-speed transmission signal technology to realize wireless signal bridging between the vehicle terminal, the user end, the local area network and the wide area network end, and is used for real-time online packet transmission of communication signals to the user end, the central control module is used for the vehicle communication system to calculate and process communication information and control the connection of network communication signals, and the vehicle terminal display module is used for processing graphic and voice information displayed in incoming call communication, and intelligently controlling incoming call communication and displaying communication information in human-computer interaction through the vehicle terminal.

[0035] In this embodiment, it is necessary to specifically explain that the GPRS module combines mobile communication technology and data communication technology to enable the vehicle serial port bridge communication system to quickly and in real time connect to the user end. GPRS is based on GSM and adopts packet transmission of data information. The bridge unit in the GPRS module refers to the connection, signal transmission and intelligent control of the devices at both ends of the serial port through the bridge. The bridge is a transmission storage device connecting two networks and is used to expand the local area network. The COM unit refers to the serial communication port. The interface connecting each device in the vehicle communication system uses a serial port for communication over a longer distance. The transceiver unit refers to the device for sending and receiving signals between the wireless network and the vehicle communication system. It includes a receiving device and a transmitting device. In the system, the wireless signal is received through the wireless network and transmitted in the GPRS. The information data result is calculated by the computer control system and an execution instruction is issued from the transmitting device.

[0036] After the bridge is connected to the network, it works at the data link layer, and exchanges network data through data reception, filtering communication volume and data transmission, thereby improving the security and reliability of the network and expanding the network range. The COM unit transmits data and control information one by one, and adopts a bus to control remote communication. The RS-485 bus is adopted in the vehicle communication system, which has the ability to suppress common-mode interference. The RS-485 adopts a balanced transmission method to realize communication between multiple devices. In the communication system of the vehicle terminal serial port bridge, the RS-485 bus packet bridges the network communication of the local area network, the central control computer and the vehicle terminal. The transceiver unit adopts wireless transceiver, uses the computer programming language, and matches the running code on the transceiver chip to receive and transmit network communication information.

[0037] In this embodiment, it is necessary to specifically explain that the processor unit in the central control module includes a CPU, an MPU and an A / D converter. The processor unit is used to identify, analyze, extract, convert and store the communication information received by the serial port bridge. The CPU is the core of the processor unit for computing data and is used for receiving information processing and program running. The MPU is an operation unit for extracting program running instructions, executing instructions and exchanging information with external memory and logic components. The CPU and MPU both process control data. The MPU is composed of a register stack, an operator, a timing control circuit and a data bus, and performs operations, storage and control on the received communication information. The A / D converter is an electronic component that converts analog signals into digital signals. In the vehicle communication system, the electrical signal generated by the transceiver unit with a continuous period of time and a continuous amplitude is converted into a digital signal with discrete time and discrete amplitude. The memory unit in the central control module refers to the memory component of the timing logic circuit that stores data and operation programs during the system transmission signal.

[0038] The A / D converter processes the communication electrical signals received by the communication system of the vehicle terminal serial port bridge and converts them into digital signals that can be processed by the processor. The A / D converter converts the signals into three processes: sampling, quantization and encoding. In the communication system of the vehicle terminal serial port bridge, the A / D converter adopts a parallel comparison type conversion speed to be faster. The memory unit is a collection of multiple storage units arranged in order of unit numbers. It can exchange information with the processor unit and adopts shared memory technology to improve the direct operation rate of the processor. The address register MAR is stored in the memory unit, and the IP address of the incoming call communication can be stored and analyzed. In the vehicle communication system, the memory adopts RAM type, which can quickly read and store communication information.

[0039] In this embodiment, it should be specifically explained that the power supply unit in the central control module provides current to the GPRS module, the vehicle terminal display module and the central control module in the network, so that the receiving device of the communication system can receive signals in real time without interruption. The power supply unit includes an integrated circuit and an I / O interface control. In the system module, the connection of each device is connected through an integrated circuit for connecting power and transmitting signals. The port where each device is connected to the integrated circuit is an I / O interface, and the power supply unit can control the I / O.

[0040] The integrated circuit is an electronic device formed by wiring and connecting the transistors, inductors, and capacitors required in the circuit. The integrated circuit is used to run electronic components for vehicle-mounted terminal communications. The I / O interface control refers to the I / O interface and I / O control respectively. The I / O interface refers to the connection component of the interface circuit used to exchange information between the central control module and other modules. Data input and output are transmitted from the I / O interface. I / O control is divided into four modes: program control, interrupt control, DMA control, and channel control. However, the channel control method is used in the vehicle-mounted communication system to reduce CPU intervention, use the CPU, channel, and I / O in parallel, improve system resource utilization, and realize data information exchange.

[0041] In this embodiment, it is necessary to specifically explain that the vehicle terminal display module is used to display communication information on the display screen of the vehicle terminal. Displaying data is the last step of data information feedback and human-computer interaction after data processing. In the vehicle terminal display module, the voice control unit refers to the vehicle terminal displaying the incoming call communication information through voice synthesis technology to remind the driver whether to connect the incoming call communication. On the other hand, it refers to the driver receiving voice information through the voice sensor, performing voice recognition, extraction, analysis and conversion into a digital signal processed by the CPU, and transmitting a signal through the transmitting unit in the GPRS module to feed back to the caller. The graphic display unit refers to the communication signal received by the processor and converted into an image and text content on the terminal display module through GPU processing operation;

[0042] The voice control unit is composed of voice collection, voice processing, voice training, voice recognition, voice extraction, voice synthesis and voice input and output control. The voice collection is to receive signals through a voice sensor and convert the driver's voice signal into a voice pulse sequence for storage. The voice processing is to filter the interference signal and vector quantize the pulse sequence of the collected voice data. The voice training is to simulate the matching of the voice extraction feature value and use the HMM model for calculation and processing. The voice recognition is to compare and evaluate the collected voice feature vector with the voice model in the voice template library. The voice extraction is to extract the voice feature quantity during the voice collection process. The voice synthesis uses voice synthesis technology to convert digital information into a voice pulse signal for display. The voice input and output control is to input and output corresponding control instructions according to the results of voice recognition, and is executed through the central control module. The graphic display unit displays communication information through the pixels of the LED display screen and intelligently selects the SMS reply template to send to the incoming call communication terminal.

[0043] In this embodiment, it is necessary to specifically explain that the communication system for serial port bridging of the vehicle-mounted terminal receives incoming call communication, and the specific judgment process steps are as follows:

[0044] A1. First, start GPRS to receive communication signals. If no signal is received, the terminal will not display. If a signal is received, the serial port transmission signal will be processed and stored in the central control module to determine the incoming call communication;

[0045] A2. If the incoming call is judged to be a nuisance call, the central control module intelligently interrupts the communication connection and the terminal does not display it. If the incoming call is judged not to be a nuisance call, it is displayed on the vehicle terminal by voice and text conversion;

[0046] A3. Finally, the user receives or rejects the incoming call displayed on the vehicle terminal through voice control. The voice controls the GPRS module to send a text message to notify the caller. The user is in a driving state and it is inconvenient to answer the incoming call.

[0047] In the communication system of the serial port bridge of the vehicle terminal, the transmission speed of the serial port bridge is increased, and the voice and graphic intelligent control mode is displayed on the vehicle terminal to improve the system communication performance and improve the safety and reliability of the driver during driving.

[0048] In this embodiment, a communication method for serial port bridging of a vehicle terminal needs to be specifically described, which specifically includes the following steps:

[0049] 101. First, use the serial port bridge method in the vehicle communication system to connect each module to the network;

[0050] In this embodiment, it should be specifically explained that the serial port bridge is in the serial port communication, the serial port sends and receives bytes bit by bit, and remote communication is realized through bridging. In the communication system of the vehicle terminal serial port bridge, the serial port communication is realized by writing computer code to read and write data. The code that can be used is as follows: HANDLE h=CreateFile(_T("COM1:"), / / Open the serial port

[0051] File name GENERIC_READ|GENERIC_WRITE,

[0052] Desire access 0,Share modeNULL,

[0053] Security attributesOPEN_EXISTING,

[0054] Create disposition0,Flag and attributes NULL

[0055] Template file); / / Clear the buffer

[0056] PurgeComm(h,PURGE_RXCLEAR|PURGE_TXCLEAR|PURGE_RXABORT|PURGE_TXABORT);

[0057] if(!GetCommState(h,&dcb))return FALSE; / / Set serial port function

[0058] switch(BaudRate); / / Read data

[0059] while(bRunning)

[0060] {if(!WaitCommEvent(h,&dwCommEvent,NULL));continue;

[0061] if((dwCommEvent&EV_RXCHAR)!=EV_RXCHAR);continue;}.

[0062] 102. During the communication process, the speed of sending and receiving signals is increased by improving the communication speed of the serial port bridge;

[0063] In this embodiment, it is necessary to specifically explain that the communication speed of the serial port bridge is improved by adjusting the parameters of the serial port communication. The parameters that can affect the communication speed in the serial port communication include baud rate, data bit, stop bit and parity check. The baud rate refers to the number of bits transmitted per second. FPGA is used to increase the serial port baud rate and computer language is used to control the frequency division ratio to increase the baud rate. The data bit is a parameter that measures the actual data bit in the communication. The stop bit refers to the last bit of the information packet, the number of bits at the end of the data transmission clock, and the parity check is a serial port communication error detection method. The method of improving the communication speed uses computer language control to change the baud rate code of a higher rate as follows:

[0064] diff --git a / arch / arm64 / boot / dts / rockchip / rk3568-linux.dtsi b / arch / arm64 / boot / dts / rockchip / rk3568-linux.dtsi

[0065] index 8e96b1b..5fab012 100644;

[0066] a / arch / arm64 / boot / dts / rockchip / rk3568-linux.dtsi;

[0067] +++b / arch / arm64 / boot / dts / rockchip / rk3568-linux.dtsi;

[0068] #-15,7+15,7#

[0069] rockchip,wake-irq= <0> ;

[0070] / *If enable uart uses irq instead of fiq* /

[0071] rockchip,irq-mode-enable= <1> ;

[0072] -rockchip,baudrate= <1500000> ; / *Only 115200and 1500000* / +rockchip,baudrate= <115200> ; / *Only 115200 and 1500000* /

[0073] interrupts=<GIC_SPI 252IRQ_TYPE_LEVEL_LOW> ;

[0074] pinctrl-names="default";

[0075] pinctrl-0 = <&uart2m0_xfer>; / / Edit the change higher baud rate code on the processor.

[0076] 103. Then the central control module reads, writes, analyzes, programs and stores the serial port receiving and sending signals;

[0077] In this embodiment, it should be specifically explained that the CPU and MPU in the processor unit read and write the serial port bridge signal through the program language, and the specific reading and writing codes are as follows:

[0078] struct rw_semaphore rw_sem; / / define read and write semaphore

[0079] void init_rwsem(struct rw_semaphore*rw_sem); / / Initialize the read and write semaphore

[0080] void down_read(struct rw_semaphore*rw_sem); / / Get the read semaphore

[0081] int down_read_trylock(struct rw_semaphore*rw_sem); / / Try to get the read semaphore

[0082] void down_write(struct rw_semaphore*rw_sem); / / Get write semaphore

[0083] int down_write_trylock(struct rw_semaphore*rw_sem); / / Try to obtain the write semaphore. The analysis is to model the read and written data, adopt Fourier analysis, and store it by processor operation. The Fourier analysis refers to Fourier analysis, which analyzes and processes the information received through Fourier transform.

[0084] 104. Finally, the processed communication information is displayed on the vehicle terminal in the form of pictures, texts or voices;

[0085] In this embodiment, it should be specifically explained that after the communication information is processed, it becomes visual graphic information and audible voice information and is displayed through the display terminal. The driver can obtain the communication information from the vehicle terminal display module, and the driver can control the incoming call communication in real time from the voice control unit in the vehicle terminal display module. The driver can choose to interrupt the communication content, receive the incoming call communication in time, and take the operation method of wirelessly transmitting SMS information to feedback to the caller.

[0086] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A communication system for serial port bridging of vehicle-mounted terminals, characterized in that: It includes a GPRS module, a central control module and a vehicle-mounted terminal display module. The GPRS module includes a bridge unit, a COM unit and a transceiver unit. The central control module includes a processor unit, a memory unit and a power supply unit. The vehicle-mounted terminal display module includes a voice control unit and a graphic display unit. The GPRS module uses wireless packet high-speed transmission signal technology to achieve wireless signal bridging between the vehicle-mounted terminal, the user end, the local area network and the wide area network end, and is used for real-time online packet transmission of communication signals to the user end. The central control module is used for the vehicle-mounted communication system to calculate and process communication information and control the connection of network communication signals. The vehicle-mounted terminal display module is used to process the graphic and voice information displayed in the incoming call communication, and intelligently control the incoming call communication and display the communication information through the vehicle-mounted terminal.

2. A communication system for serial port bridging of vehicle-mounted terminals according to claim 1, characterized in that: The GPRS module combines mobile communication technology and data communication technology to enable the vehicle-mounted serial port bridge communication system to quickly and in real time connect to the user end. GPRS is based on GSM and uses packet transmission of data information. The bridge unit in the GPRS module refers to connecting, transmitting signals and intelligently controlling the devices at both ends of the serial port through a bridge. The bridge is a transmission storage device connecting two networks and is used to expand the local area network. The COM unit refers to a serial communication port. The interface connecting each device in the vehicle-mounted communication system uses a serial port for longer distance communication. The transceiver unit refers to a device for sending and receiving signals between the wireless network and the vehicle-mounted communication system. It includes a receiving device and a transmitting device. In the system, wireless signals are received through the wireless network and transmitted in GPRS. The information data results are calculated through a computer control system and execution instructions are issued from the transmitting device.

3. A communication system for serial port bridging of vehicle-mounted terminals according to claim 1, characterized in that: The processor unit in the central control module includes a CPU, an MPU and an A / D converter. The processor unit is used to identify, analyze, extract, convert and store communication information received by the serial port bridge. The CPU is the core of the processor unit for computing data and is an execution unit for receiving information processing and program running. The MPU is an operating unit for extracting program running instructions, executing instructions and exchanging information with external memory and logic components. The A / D converter is an electronic component that converts analog signals into digital signals. In the vehicle communication system, the electrical signal generated by the transceiver unit with a continuous period of time and continuous amplitude is converted into a digital signal with discrete time and discrete amplitude. The memory unit in the central control module refers to the memory component of the timing logic circuit that stores data and operation programs during the system transmission signal.

4. A communication system for serial port bridging of vehicle-mounted terminals according to claim 3, characterized in that: The power supply unit in the central control module provides current to the GPRS module, the vehicle terminal display module and the central control module in the network, so that the receiving device of the communication system can receive signals in real time without interruption. The power supply unit includes an integrated circuit and an I / O interface control. In the system module, each device is connected through an integrated circuit for connecting power and transmitting signals. The port where each device is connected to the integrated circuit is the I / O interface, and the power supply unit can control the I / O.

5. A communication system for serial port bridging of vehicle-mounted terminals according to claim 1, characterized in that: The vehicle-mounted terminal display module displays communication information on the display screen of the vehicle-mounted terminal. Displaying data is the last step of data information feedback and human-computer interaction after data processing. In the vehicle-mounted terminal display module, the voice control unit refers to the vehicle-mounted terminal displaying the information of incoming calls through voice synthesis technology on the one hand, and on the other hand, it refers to the driver receiving voice information through a voice sensor, performing voice recognition, extraction, analysis and conversion into a digital signal processed by the CPU, and transmitting a signal through the transmitting unit in the GPRS module to feed back to the caller. The graphic display unit refers to the communication signal received by the processor processed by the GPU processing operation converted into an image and text content on the terminal display module.

6. A communication system for serial port bridging of vehicle-mounted terminals according to claim 1, characterized in that: The communication system for serial port bridging of the vehicle terminal receives incoming call communication, and the specific judgment process steps are as follows: A1. First, start GPRS to receive communication signals. If no signal is received, the terminal will not display. If a signal is received, the serial port transmission signal will be processed and stored in the central control module to determine the incoming call communication; A2. If the incoming call is judged to be a nuisance call, the central control module intelligently interrupts the communication connection and the terminal does not display it. If the incoming call is judged not to be a nuisance call, it is displayed on the vehicle terminal by voice and text conversion; A3. Finally, the user receives or rejects the incoming call displayed on the vehicle terminal through voice control. The voice controls the GPRS module to send a text message to notify the caller. The user is in a driving state and it is inconvenient to answer the incoming call.

7. A communication method for serial port bridging of a vehicle-mounted terminal, characterized in that: The specific steps include: S1. First, use the serial port bridge method in the vehicle communication system to connect each module to the network; S2. During the communication process, the speed of sending and receiving signals is increased by improving the communication speed of the serial port bridge; S3, then the central control module reads, writes, analyzes, programs and stores the serial port receiving and sending signals; S4. Finally, the processed communication information is displayed on the vehicle terminal in the form of graphics, text or voice.

8. A communication method for serial port bridging of a vehicle-mounted terminal according to claim 7, characterized in that: The communication speed of the serial port bridge is improved by adjusting the parameters of the serial port communication. The parameters that can affect the communication speed in the serial port communication include baud rate, data bit, stop bit and parity check. The baud rate refers to the number of bits transmitted per second. The baud rate of the serial port is increased by using FPGA and the frequency division ratio is controlled by computer language to increase the baud rate. The FPGA is a programmable logic array chip that can control the I / O interface, RAM processor and wiring.

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